I would say go ahead if you want to. For myself I think I've kinda exhausted the topic.
Well, if your interest in the topic is exhausted after two pages of comments, it may not work as a book.
But fever can be a sign of more serious conditions, and the effect of fever depends on a mixture of things, including the patient's age, the patient's overall health, and the height of the fever itself.
Well, for example, Helen Keller lost her sight and hearing to an illness that may have been scarlet fever. It seems like a lot of diseases were called "fever" back in them days, but perhaps that's simply because they were accompanied by high fevers, which at that level of medicine might have been about all they could use to diagnose it, or at least were its most observable symptom. (And maybe because it just sounds better than "scarlet vomiting and diarrhea.")
According to Wikipedia, doctors described her illness as "an acute congestion of the stomach and the brain." Who knows what that means (or how they diagnosed it), but I would think that "brain congestion" could mess up vision and hearing. The fever was probably trying to kill whatever caused the congestion, but didn't in itself cause the blindness and deafness. That explanation makes sense to me, anyway.
Alternatively, I suppose it's possible her body "knew" that a really high fever in itself could cause sight and hearing damage, but figured those risks/sacrifices were worth it to save her life.